Mattress



FIG. 1 is a perspective view of the mattress.

FIG. 2 is a top view of the mattress.

FIG. 3 is a bottom view of the mattress.

FIG. 4 is a right side view of the mattress.

FIG. 5 is a left side view of the mattress.

FIG. 6 is a front view of the mattress; and,

FIG. 7 is a rear view of the mattress. 

CLAIM An ornamental design for a mattress, as shown and described in the drawings. 